What does this compressor part do?

Categorized as Uncategorized 2 Comments on What does this compressor part do?
Hey! This site is reader-supported and we earn commissions if you purchase products from retailers after clicking on a link from our site.

Perhaps can help when you have a question about what does this compressor part do?

And, even if we cannot identify the part in question ourselves, by seeing pictures of the compressor part, someone else may be able to identify it and post a comment letting us all know what it is.

So, upload three or four images from different sides of the compressor. Please always provide the make and model of your air compressor in your comment if possible.

Do you have an air compressor that you cannot identify? Feel free to add some pictures of it, asking folks to help you figure out the make and model of your air compressor.

Let’s see if we can figure out what does this compressor part do? Send in your questions and photos (at least one photo must accompany each question please) using the comment form and image upload link below.

By Ashley Pearce

As a passionate manufacturing and mechanical engineer, I've had my fair share of run ins with air compressors and compressed air systems. With over a decade of experience in the industry, I have both a fresh perspective and time-served hands and mind to help you with your compressor problems (along with our able community!)

Notify of
Inline Feedbacks
View all comments
October 20, 2015 1:15 pm

Hi Willyr,

I have a small single pump compressor running on 240 volts that has not had a lot of use but will just not build pressure above 10 psi in the tank. It was bought in the UK through a retailer called Machine Mart and carries the brand name of Clarke.

After reading through your excellent information I suspect that the problem lies with the compressor tank check valve with perhaps a bit of debris not allowing the valve to seat properly. The inlet side of the pump sucks very well and the outlet appears to pump well too.

However, before reading your excellent articles I started by looking over a few things and one components purpose has me baffled. On the airline from the pump enroute to the air receiver/tank (but within 3″ of the pump itself) is a spring loaded brass valve where the airline takes a right angled turn downwards towards the receiver and pressure switch. What is the purpose of this valve please? Is it to purge compressed air from the pipe to enable a restart after the tanks pressure drops like an unloader valve? I thought that that valve was always in the pressure switch ( which is about a foot below) so I’m unsure what this extra valve is called to enable me to buy a replacement, since i have damaged it.

Any advice gratefully received!


Fix My Compressor Moderator
Fix My Compressor Moderator
Reply to  Godfrey
October 20, 2015 4:03 pm

Please add a new comment and use the just-installed image upload function to include a few pictures of your air compressor and the component in question. We will take a look and see if we can identify the part for you. It’s always good to include a model number of any air compressor you are interested in working on, as sometimes the model number will lead to an on-line image.